EP 1710290 A3 20061129 - Electroluminescent phosphor powder with d50 valur of less than 12 um and method of making.
Title (en)
Electroluminescent phosphor powder with d50 valur of less than 12 um and method of making.
Title (de)
Elektrolumineszentes Pulver mit einem d50 Wert von weniger als 12 um und verfahren zu seiner Herstellung.
Title (fr)
Poudre electroluminescente d'une distribution de taille de particules d50 de moins de 12 um et procede de fabrication.
Publication
Application
Priority
US 90736005 A 20050330
Abstract (en)
[origin: EP1710290A2] There is presented an electroluminescent phosphor powder of copper-activated zinc sulfide particles that has a size distribution with a D50 value of less than 12µm, and more preferably less than 10µm. The powder is preferably made by a method that includes the steps of combining copper-doped zinc sulfide with sulfur, zinc oxide and a chloride-containing flux to form a first mixture; preliminarily firing the first mixture and milling the preliminarily fired first mixture to form a milled material having a D50 value of less than or equal to about 5µm; blending the milled material with sulfur, zinc oxide and a chloride-containing flux to form a second mixture; firing the mixture in a first firing step at a temperature in a range of about 1020°C to about 1080°C to form a hexagonal zinc sulfide material; inducing defects into the hexagonal zinc sulfide material; firing the hexagonal zinc sulfide material in a second firing step at a temperature in a range of about 650°C to about 850°C to form an electroluminescent phosphor; and sifting the electroluminescent phosphor to provide an electroluminescent phosphor powder comprising phosphor particles that have a size distribution with a D50 value of less than 12µm. The step of inducing defects may be accomplished by milling, mulling or sonification of the mixture.
IPC 8 full level
C09K 11/54 (2006.01)
CPC (source: EP US)
C09K 11/584 (2013.01 - EP US)
Citation (search report)
- [X] WO 0134723 A1 20010517 - BUNDESDRUCKEREI GMBH [DE], et al
- [A] EP 1215263 A2 20020619 - OSRAM SYLVANIA INC [US]
- [A] WO 9116722 A1 19911031 - LOCTITE LUMINESCENT SYST [US]
- [A] EP 1367113 A2 20031203 - OSRAM SYLVANIA INC [US]
- [A] US 6702958 B2 20040309 - TAKEHARA TOSHIFUMI [JP], et al
- [A] US 5525313 A 19960611 - KAWANO KENICHI [JP], et al
- [A] DE 887094 C 19530820 - GEN ELECTRIC
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
Designated extension state (EPC)
AL BA HR MK YU
DOCDB simple family (publication)
EP 1710290 A2 20061011; EP 1710290 A3 20061129; CA 2532008 A1 20060930; JP 2006283019 A 20061019; US 2006220547 A1 20061005; US 7291291 B2 20071106
DOCDB simple family (application)
EP 06006627 A 20060329; CA 2532008 A 20060104; JP 2006083030 A 20060324; US 90736005 A 20050330